I don't know how it is done in Kyokushin specifically, but as stated earlier, it is one of the styles that emphasizes real training and doesn't just pass out black belts like some of the commercialized schools do. For a style that requires real work, it is a minimum of five years to get a black belt, and that is if you train consistently and know the material. In such a style it depends to a large extent on the student and how much time he or she puts into it. In any style, I can't imagine anyone getting 1st Dan without it taking at least five years; it takes at least that long to have a decent understanding of material and be able to perform it well; after that there is constant refining. I realize you say you've been at 5th Kyu after 5 years training, so it might be your instructor has certain requirements which he sees fit is necessary for someone to move on beyond that level. If I remember correctly, Kyokushin emphasizes fighting; some systems require some fighting to be done to get rank. Maybe he's looking at fighting in class, at tournaments, etc. I don't know. I think the important part is that a student enjoys the art, loves what he's doing and loves learning and the training, and gets better at it for him or herself. Edit: I just Googled it; yes, that's Oyama's style; that's a tough one; they're going to be having some tough requirements; Oyama was a tough guy. I think they also have the tough tournaments, some of the first to allow full contact. It came back to me.